I have just put the tein basics(coilovers) on my ride and while I'm at it I was thinking about going with an adjustable A-arm. Any thoughts? I just want to fix this feathering issue before it has a chance to be an issue for me.

 

I have them. I use them to get more camber and I have no feather problem, nor did I ever. They work great and should be able to put any resonable camber under 2 deg you need. Make sure you re-set your toe.

 

The feathering issue is one of toe, you may not even need a camber kit to compensate for the drop, I used Eibachs and theh camber was right at the max or min -1.3 Over time I will get some inner edge wear but the camber is better for handling